Optimization of the LiDAR optical design for measurement of the aerosol extinction vertical profile. Alessia Sannino *1, Antonella Boselli 3, Gaetano Sasso4,

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Presentation transcript:

Optimization of the LiDAR optical design for measurement of the aerosol extinction vertical profile. Alessia Sannino *1, Antonella Boselli 3, Gaetano Sasso4, Nicola Spinelli1, Xuan Wang2 . 1 Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia (CNISM) and Dip. Fisica “E. Pancini”, Università degli Studi di Napoli Federico II, Napoli, Italy , 2 Istituto Superconduttori, Materiali innovativi e Dispositivi (SPIN) – CNR, Italy , 2 Istituto di Metodologie per l’Analisi Ambientale (IMAA) – CNR, Italy ,4ALA Advanced LiDAR Applications s.r.l., Napoli, Italy *alessia.sannino@fisica.unina.it

OVERVIEW Why low range atmosphere information are so important LiDAR capabilities Our proposal Results and Conclusions alessia.sannino@fisica.unina.it 25 September, Anacapri

ARMOSPHERIC PARTICLES INTRODUCTION Radius (range covered:107) Anthropogenic Source ARMOSPHERIC PARTICLES MOLECULAS AEROSOL Shape p, T → δ(r) Geographical source Generation processes Natural Source alessia.sannino@fisica.unina.it 25 September, Anacapri

INTRODUCTION Lidar Equation: Overlap Function Backscattering coeff. Extinction coeff. Overlap Function A. L. Oramas COAXIAL BIAXIAL alessia.sannino@fisica.unina.it 25 September, Anacapri alessia.sannino@fisica.unina.it 25 September, Capri

PERFORMING LIDAR PROTOTYPE FEATURES 500mm 400mm Output laser wavelength 355nm Repetition Frequency 2kHz Telescope 200mm Cassegrain F/n 2.5 Channels 355S, 355p, 386 Weight 35kg 290mm alessia.sannino@fisica.unina.it 25 September, Capri alessia.sannino@fisica.unina.it 25 September, Anacapri

RESULT I Raman Overlap (res.60m) Horizontal Overlap (res.15m) compared with Simulated Overlap function (res 15m) 120m alessia.sannino@fisica.unina.it 25 September, Anacapri alessia.sannino@fisica.unina.it 25 September, Capri

Comparison of the signals measured with different Lidar systems RESULT II Comparison of the signals measured with different Lidar systems MALIA is - the fixed system based at the Physics Department of University “Federico II” di Napoli Actris and EARLINET network. 3 beta and 2 alpha 2 depolarization channels telescope field of view at 1.33 mrad 300 mm Newtonian telescope Nd:YAG @1064nm, 532nm and 355nm MALIA @R386 nm alessia.sannino@fisica.unina.it 25 September, Anacapri alessia.sannino@fisica.unina.it 25 September, Capri

RESULT III Comparison of the signals measured with different Lidar systems ACTRIS facilities Cassegrain telescope 200mm/48mm Field of view: 2.5 mrad alessia.sannino@fisica.unina.it 25 September, Capri alessia.sannino@fisica.unina.it 25 September, Anacapri

SUMMARY AND CONCLUSION A study on several optical assembly has been conducted in order to find the best configuration system which guaranteed a good signal started from the lowest possible altitude. The optimized optical system has been obtained with a choice on F-number of 2.5. This optimized optical system has been realized for a compact Lidar system which allowed to test both with simulated and measured results its Overlap function. The test results shown an Overlap function of a few tens on meters (~120m). alessia.sannino@fisica.unina.it 25 September, Anacapri alessia.sannino@fisica.unina.it 25 September, Capri

Thanks! alessia.sannino@fisica.unina.it

RESULT III Comparison of the signals measured with different Lidar systems ACTRIS facilities Cassegrain telescope 200mm/48mm Field of view: 2.5 mrad alessia.sannino@fisica.unina.it 25 September, Capri alessia.sannino@fisica.unina.it 25 September, Anacapri